by his/her inherited genotype because biological parents provide both genetic material and a rearing environment for their offspring) (Scarr and McCartney, 1983). With respect to conduct disorder, there is retrospective longitudinal evidence that males select into peer groups whose level of deviance are consistent with their own genetic predispositions for conduct disorder (Kendler et al., 2008). Thus, individuals who are at greater genetic risk for developing conduct disorder also select into environments that further increase their risk.
